var gulp = require('gulp');
var execFile = require('child_process').execFile;
var glob = require('glob');

function exec(command, cb) {
    execFile('sh', ['-c', command], cb);
}

var protoc = process.env.PROTOC || '../src/protoc';

var wellKnownTypes = [
    '../src/google/protobuf/any.proto',
    '../src/google/protobuf/api.proto',
    '../src/google/protobuf/compiler/plugin.proto',
    '../src/google/protobuf/descriptor.proto',
    '../src/google/protobuf/duration.proto',
    '../src/google/protobuf/empty.proto',
    '../src/google/protobuf/field_mask.proto',
    '../src/google/protobuf/source_context.proto',
    '../src/google/protobuf/struct.proto',
    '../src/google/protobuf/timestamp.proto',
    '../src/google/protobuf/type.proto',
    '../src/google/protobuf/wrappers.proto',
];

var group1Protos = [
    'data.proto',
    'test3.proto',
    'test5.proto',
    'commonjs/test6/test6.proto',
    'test8.proto',
    'test11.proto',
    'test12.proto',
    'test13.proto',
    'test14.proto',
    'test15.proto',
    'testbinary.proto',
    'testempty.proto',
    'test.proto',
    'testlargenumbers.proto',
];

var group2Protos = [
    'proto3_test.proto',
    'test2.proto',
    'test4.proto',
    'commonjs/test7/test7.proto',
];

var group3Protos = [
    'test9.proto',
    'test10.proto'
];


gulp.task('genproto_well_known_types_closure', function (cb) {
    exec(protoc + ' --js_out=one_output_file_per_input_file,binary:. -I ../src -I . ' + wellKnownTypes.join(' '),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});

gulp.task('genproto_group1_closure', function (cb) {
    exec(protoc + ' --js_out=library=testproto_libs1,binary:.  -I ../src -I . ' + group1Protos.join(' '),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});

gulp.task('genproto_group2_closure', function (cb) {
    exec(
        protoc +
        ' --experimental_allow_proto3_optional --js_out=library=testproto_libs2,binary:.  -I ../src -I . -I commonjs ' +
        group2Protos.join(' '),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});

gulp.task('genproto_well_known_types_commonjs', function (cb) {
    exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src ' + wellKnownTypes.join(' '),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});

gulp.task('genproto_group1_commonjs', function (cb) {
    exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src -I commonjs -I . ' + group1Protos.join(' '),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});

gulp.task('genproto_group2_commonjs', function (cb) {
    exec(
        'mkdir -p commonjs_out && ' + protoc +
        ' --experimental_allow_proto3_optional --js_out=import_style=commonjs,binary:commonjs_out -I ../src -I commonjs -I . ' +
        group2Protos.join(' '),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});

gulp.task('genproto_commonjs_wellknowntypes', function (cb) {
    exec('mkdir -p commonjs_out/node_modules/google-protobuf && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out/node_modules/google-protobuf -I ../src ' + wellKnownTypes.join(' '),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});

gulp.task('genproto_wellknowntypes', function (cb) {
    exec(protoc + ' --js_out=import_style=commonjs,binary:. -I ../src ' + wellKnownTypes.join(' '),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});
gulp.task('genproto_group3_commonjs_strict', function (cb) {
    exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs_strict,binary:commonjs_out -I ../src -I commonjs -I . ' + group3Protos.join(' '),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});


function getClosureCompilerCommand(exportsFile, outputFile) {
    const closureLib = 'node_modules/google-closure-library';
    return [
        'node_modules/.bin/google-closure-compiler',
        `--js=${closureLib}/closure/goog/**.js`,
        `--js=${closureLib}/third_party/closure/goog/**.js`, '--js=map.js',
        '--js=message.js', '--js=binary/arith.js', '--js=binary/constants.js',
        '--js=binary/decoder.js', '--js=binary/encoder.js', '--js=binary/reader.js',
        '--js=binary/utils.js', '--js=binary/writer.js', `--js=${exportsFile}`,
        `--entry_point=${exportsFile}`, `> ${outputFile}`
    ].join(' ');
}

gulp.task('dist', gulp.series(['genproto_wellknowntypes'], function (cb) {
    // TODO(haberman): minify this more aggressively.
    // Will require proper externs/exports.
    exec(
        getClosureCompilerCommand('commonjs/export.js', 'google-protobuf.js'),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
}));

gulp.task('commonjs_asserts', function (cb) {
    exec(
        'mkdir -p commonjs_out/test_node_modules && ' +
        getClosureCompilerCommand(
            'commonjs/export_asserts.js',
            'commonjs_out/test_node_modules/closure_asserts_commonjs.js'),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});

gulp.task('commonjs_testdeps', function (cb) {
    exec(
        'mkdir -p commonjs_out/test_node_modules && ' +
        getClosureCompilerCommand(
            'commonjs/export_testdeps.js',
            'commonjs_out/test_node_modules/testdeps_commonjs.js'),
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
});

gulp.task(
    'make_commonjs_out',
    gulp.series(
        [
            'dist', 'genproto_well_known_types_commonjs',
            'genproto_group1_commonjs', 'genproto_group2_commonjs',
            'genproto_commonjs_wellknowntypes', 'commonjs_asserts',
            'commonjs_testdeps', 'genproto_group3_commonjs_strict'
        ],
        function (cb) {
            // TODO(haberman): minify this more aggressively.
            // Will require proper externs/exports.
            var cmd =
                'mkdir -p commonjs_out/binary && mkdir -p commonjs_out/test_node_modules && ';

            function addTestFile(file) {
                cmd += 'node commonjs/rewrite_tests_for_commonjs.js < ' + file +
                    ' > commonjs_out/' + file + '&& ';
            }

            glob.sync('*_test.js').forEach(addTestFile);
            glob.sync('binary/*_test.js').forEach(addTestFile);

            exec(
                cmd + 'cp commonjs/jasmine.json commonjs_out/jasmine.json && ' +
                'cp google-protobuf.js commonjs_out/test_node_modules && ' +
                'cp commonjs/strict_test.js commonjs_out/strict_test.js &&' +
                'cp commonjs/import_test.js commonjs_out/import_test.js',
                function (err, stdout, stderr) {
                    console.log(stdout);
                    console.log(stderr);
                    cb(err);
                });
        }));

gulp.task(
    'deps',
    gulp.series(
        [
            'genproto_well_known_types_closure', 'genproto_group1_closure',
            'genproto_group2_closure'
        ],
        function (cb) {
            exec(
                './node_modules/.bin/closure-make-deps --closure-path=. --file=node_modules/google-closure-library/closure/goog/deps.js binary/arith.js binary/constants.js binary/decoder.js binary/encoder.js binary/reader.js binary/utils.js binary/writer.js debug.js map.js message.js node_loader.js test_bootstrap.js > deps.js',
                function (err, stdout, stderr) {
                    console.log(stdout);
                    console.log(stderr);
                    cb(err);
                });
        }));

gulp.task(
    'test_closure',
    gulp.series(
        [
            'genproto_well_known_types_closure', 'genproto_group1_closure',
            'genproto_group2_closure', 'deps'
        ],
        function (cb) {
            exec(
                'JASMINE_CONFIG_PATH=jasmine.json ./node_modules/.bin/jasmine',
                function (err, stdout, stderr) {
                    console.log(stdout);
                    console.log(stderr);
                    cb(err);
                });
        }));

gulp.task('test_commonjs', gulp.series(['make_commonjs_out'], function (cb) {
    exec('cd commonjs_out && JASMINE_CONFIG_PATH=jasmine.json NODE_PATH=test_node_modules ../node_modules/.bin/jasmine',
        function (err, stdout, stderr) {
            console.log(stdout);
            console.log(stderr);
            cb(err);
        });
}));

gulp.task('test', gulp.series(['test_closure', 'test_commonjs'], function (cb) {
    cb();
}));
